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INTRODUCTION
Energy harvesting is defined as capturing minute amounts of energy from one or more of the surrounding energy sources, accumulating them and storing them for later use. Energy harvesting is also called as power harvesting or energy scavenging. With recent advances on wireless and micro-electromechanical systems (MEMS) technology, energy harvesting is highlighted as the alternatives of the conventional battery. In the view point of energy conversion, human beings have already used energy harvesting technology in the form of windmill, watermill, geothermal and solar energy